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For a stone or a pebble the best method is to use a graduated cylinder and the displacement method. Fill the jar with water to a level so that the pebble can be completely submerged. Read of the volume. Then insert the stone or pebble into the cylinder and read off the new volume. The difference between the two will be the required volume.

However, for a rock the equipment needs to be scaled up and graduated cylinders don't usually come that big. So you will need a bucket or something in which the rock can fit and a tray or large enough container to catch the spill from the bucket (see next paragraph).

Put the bucket in the tray. Fill the bucket with water - full to the top. Then very gently lower the stone into the bucket, catching all the spilling water in the tray. Measure the water in the tray using whatever measuring equipment you can get hold of. That is the volume of the rock.

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Q: What method is the best way to find the volume of a rock?
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